<template>
  <el-menu
    default-active="1-4-1"
    class="el-menu-vertical-demo"
    @open="handleOpen"
    @close="handleClose"
    :collapse="isCollapse"
    background-color="#545c64"
    text-color="#fff"
    active-text-color="#ffd04b"
  >
    <h3>{{ isCollapse ? "后台" : "通用后台管理系统" }}</h3>
    <el-menu-item
      v-for="item in noChildren"
      :key="item.name"
      :index="item.name"
      @click="clickMenu(item)"
    >
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{ item.label }}</span>
    </el-menu-item>
    <el-submenu
      v-for="item in hasChildren"
      :key="item.label"
      :index="item.label"
    >
      <template slot="title">
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{ item.label }}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
        <el-menu-item @click="clickMenu(subItem)" :index="subItem.path">{{
          subItem.label
        }}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>

<script>
import Cookie from "js-cookie";
export default {
  data() {
    return {};
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },

    // 点击菜单
    clickMenu(item) {
      // 解决重复跳转页面报错问题
      // 当前页面路由与要跳转路由不一致才跳转
      console.log(item);
      if (
        this.$route.path !== item.path &&
        !(this.$route.path === "/home" && item.path === "/")
      ) {
        this.$router.push(item.path);
        this.$store.commit("updateBread", item);
      }
    },
  },
  computed: {
    // 没有子菜单
    noChildren() {
      return this.menuData.filter((item) => !item.children);
    },
    // 有子菜单
    hasChildren() {
      return this.menuData.filter((item) => item.children);
    },
    isCollapse() {
      return this.$store.state.tab.collapse;
    },
    // 从store中获取菜单数据
    menuData() {
      // 判断cookie中是否有菜单数据，如没有就从store中获取
      return JSON.parse(Cookie.get("menu")) || this.$store.state.tab.menu;
    },
  },
};
</script>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  height: 100vh;
  border-right: none;
  h3 {
    color: #fff;
    line-height: 48px;
    text-align: center;
    font-size: 16px;
    font-weight: 400;
  }
}
</style>
